• Product name
    Anti-p53 antibody [PAb 1801]
    See all p53 primary antibodies
  • Description
    Mouse monoclonal [PAb 1801] to p53
  • Host species
  • Specificity
    This monoclonal p53 antibody recognizes both wild type and mutant forms of human p53 protein. The epitope has been mapped to amino acids 46-55 of human p53. Due to low sequence homology with the epitope, we do not expect ab28 to react with mouse and rat samples so cannot guarantee reactivity in these species. Please note that the following publications suggest that the PAb 1801 clone also cross reacts with an unknown component of processing bodies (P-bodies) (PMID: 11313875; PMCID: PMC3349707). Please ensure that appropriate controls (e.g. MW ladder, treatment to induce p53 expression) are included to ensure the positive signal is from p53.
  • Tested applications
    Suitable for: ChIP, WB, IP, ELISA, RIAmore details
  • Species reactivity
    Reacts with: Human
  • Immunogen

    Fusion protein corresponding to Human p53 (N terminal).
    Database link: P04637

  • Epitope
    aa 46-55 of human p53
  • Positive control
    • WB: A431 cell lysate, MDA-MB-231 cell lysate.
  • General notes

    This monoclonal p53 antibody has been knockout validated in Western blot. The expected band for p53 was observed in HCT116 cells treated with irinotecan and the band was not seen in TP53 knockout HCT116 cell lysate.

    For Western blot, we recommend using 3% milk as the blocking agent.

    We recommend using ab1101 or ab154036, alternative mouse monoclonal antibodies, to detect human p53 by IHC, ICC/IF or flow cytometry since they perform better in these applications.

    This antibody clone is manufactured by Abcam.

    If you require this antibody in a particular buffer formulation or a particular conjugate for your experiments, please contact orders@abcam.com or you can find further information here.



Our Abpromise guarantee covers the use of ab28 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
ChIP Use at an assay dependent concentration.

Use at an assay dependent concentration.


WB Use a concentration of 5 µg/ml. Detects a band of approximately 53 kDa (predicted molecular weight: 53 kDa).

We recommend using 3% milk as the blocking agent for Western blot.

IP Use at 10 µg/mg of lysate.
ELISA Use at an assay dependent concentration.
RIA Use at an assay dependent concentration.


  • Function
    Acts as a tumor suppressor in many tumor types; induces growth arrest or apoptosis depending on the physiological circumstances and cell type. Involved in cell cycle regulation as a trans-activator that acts to negatively regulate cell division by controlling a set of genes required for this process. One of the activated genes is an inhibitor of cyclin-dependent kinases. Apoptosis induction seems to be mediated either by stimulation of BAX and FAS antigen expression, or by repression of Bcl-2 expression. Implicated in Notch signaling cross-over. Isoform 2 enhances the transactivation activity of isoform 1 from some but not all TP53-inducible promoters. Isoform 4 suppresses transactivation activity and impairs growth suppression mediated by isoform 1. Isoform 7 inhibits isoform 1-mediated apoptosis.
  • Tissue specificity
    Ubiquitous. Isoforms are expressed in a wide range of normal tissues but in a tissue-dependent manner. Isoform 2 is expressed in most normal tissues but is not detected in brain, lung, prostate, muscle, fetal brain, spinal cord and fetal liver. Isoform 3 is expressed in most normal tissues but is not detected in lung, spleen, testis, fetal brain, spinal cord and fetal liver. Isoform 7 is expressed in most normal tissues but is not detected in prostate, uterus, skeletal muscle and breast. Isoform 8 is detected only in colon, bone marrow, testis, fetal brain and intestine. Isoform 9 is expressed in most normal tissues but is not detected in brain, heart, lung, fetal liver, salivary gland, breast or intestine.
  • Involvement in disease
    Note=TP53 is found in increased amounts in a wide variety of transformed cells. TP53 is frequently mutated or inactivated in about 60% of cancers. TP53 defects are found in Barrett metaplasia a condition in which the normally stratified squamous epithelium of the lower esophagus is replaced by a metaplastic columnar epithelium. The condition develops as a complication in approximately 10% of patients with chronic gastroesophageal reflux disease and predisposes to the development of esophageal adenocarcinoma.
    Defects in TP53 are a cause of esophageal cancer (ESCR) [MIM:133239].
    Defects in TP53 are a cause of Li-Fraumeni syndrome (LFS) [MIM:151623]. LFS is an autosomal dominant familial cancer syndrome that in its classic form is defined by the existence of a proband affected by a sarcoma before 45 years with a first degree relative affected by any tumor before 45 years and another first degree relative with any tumor before 45 years or a sarcoma at any age. Other clinical definitions for LFS have been proposed (PubMed:8118819 and PubMed:8718514) and called Li-Fraumeni like syndrome (LFL). In these families affected relatives develop a diverse set of malignancies at unusually early ages. Four types of cancers account for 80% of tumors occurring in TP53 germline mutation carriers: breast cancers, soft tissue and bone sarcomas, brain tumors (astrocytomas) and adrenocortical carcinomas. Less frequent tumors include choroid plexus carcinoma or papilloma before the age of 15, rhabdomyosarcoma before the age of 5, leukemia, Wilms tumor, malignant phyllodes tumor, colorectal and gastric cancers.
    Defects in TP53 are involved in head and neck squamous cell carcinomas (HNSCC) [MIM:275355]; also known as squamous cell carcinoma of the head and neck.
    Defects in TP53 are a cause of lung cancer (LNCR) [MIM:211980].
    Defects in TP53 are a cause of choroid plexus papilloma (CPLPA) [MIM:260500]. Choroid plexus papilloma is a slow-growing benign tumor of the choroid plexus that often invades the leptomeninges. In children it is usually in a lateral ventricle but in adults it is more often in the fourth ventricle. Hydrocephalus is common, either from obstruction or from tumor secretion of cerebrospinal fluid. If it undergoes malignant transformation it is called a choroid plexus carcinoma. Primary choroid plexus tumors are rare and usually occur in early childhood.
    Defects in TP53 are a cause of adrenocortical carcinoma (ADCC) [MIM:202300]. ADCC is a rare childhood tumor of the adrenal cortex. It occurs with increased frequency in patients with the Beckwith-Wiedemann syndrome and is a component tumor in Li-Fraumeni syndrome.
  • Sequence similarities
    Belongs to the p53 family.
  • Domain
    The nuclear export signal acts as a transcriptional repression domain. The TADI and TADII motifs (residues 17 to 25 and 48 to 56) correspond both to 9aaTAD motifs which are transactivation domains present in a large number of yeast and animal transcription factors.
  • Post-translational
    Acetylated. Acetylation of Lys-382 by CREBBP enhances transcriptional activity. Deacetylation of Lys-382 by SIRT1 impairs its ability to induce proapoptotic program and modulate cell senescence.
    Phosphorylation on Ser residues mediates transcriptional activation. Phosphorylated by HIPK1 (By similarity). Phosphorylation at Ser-9 by HIPK4 increases repression activity on BIRC5 promoter. Phosphorylated on Thr-18 by VRK1. Phosphorylated on Ser-20 by CHEK2 in response to DNA damage, which prevents ubiquitination by MDM2. Phosphorylated on Thr-55 by TAF1, which promotes MDM2-mediated degradation. Phosphorylated on Ser-46 by HIPK2 upon UV irradiation. Phosphorylation on Ser-46 is required for acetylation by CREBBP. Phosphorylated on Ser-392 following UV but not gamma irradiation. Phosphorylated upon DNA damage, probably by ATM or ATR. Phosphorylated on Ser-15 upon ultraviolet irradiation; which is enhanced by interaction with BANP.
    Dephosphorylated by PP2A-PPP2R5C holoenzyme at Thr-55. SV40 small T antigen inhibits the dephosphorylation by the AC form of PP2A.
    May be O-glycosylated in the C-terminal basic region. Studied in EB-1 cell line.
    Ubiquitinated by MDM2 and SYVN1, which leads to proteasomal degradation. Ubiquitinated by RFWD3, which works in cooperation with MDM2 and may catalyze the formation of short polyubiquitin chains on p53/TP53 that are not targeted to the proteasome. Ubiquitinated by MKRN1 at Lys-291 and Lys-292, which leads to proteasomal degradation. Deubiquitinated by USP10, leading to its stabilization. Ubiquitinated by TRIM24, which leads to proteasomal degradation. Ubiquitination by TOPORS induces degradation. Deubiquitination by USP7, leading to stabilization. Isoform 4 is monoubiquitinated in an MDM2-independent manner.
    Monomethylated at Lys-372 by SETD7, leading to stabilization and increased transcriptional activation. Monomethylated at Lys-370 by SMYD2, leading to decreased DNA-binding activity and subsequent transcriptional regulation activity. Lys-372 monomethylation prevents interaction with SMYD2 and subsequent monomethylation at Lys-370. Dimethylated at Lys-373 by EHMT1 and EHMT2. Monomethylated at Lys-382 by SETD8, promoting interaction with L3MBTL1 and leading to repress transcriptional activity. Demethylation of dimethylated Lys-370 by KDM1A prevents interaction with TP53BP1 and represses TP53-mediated transcriptional activation.
    Sumoylated by SUMO1.
  • Cellular localization
    Cytoplasm; Cytoplasm. Nucleus. Nucleus > PML body. Endoplasmic reticulum. Interaction with BANP promotes nuclear localization. Recruited into PML bodies together with CHEK2; Nucleus. Cytoplasm. Localized in both nucleus and cytoplasm in most cells. In some cells, forms foci in the nucleus that are different from nucleoli; Nucleus. Cytoplasm. Localized in the nucleus in most cells but found in the cytoplasm in some cells; Nucleus. Cytoplasm. Localized mainly in the nucleus with minor staining in the cytoplasm; Nucleus. Cytoplasm. Predominantly nuclear but localizes to the cytoplasm when expressed with isoform 4 and Nucleus. Cytoplasm. Predominantly nuclear but translocates to the cytoplasm following cell stress.
  • Information by UniProt
  • Database links
  • Alternative names
    • Antigen NY-CO-13 antibody
    • BCC7 antibody
    • Cellular tumor antigen p53 antibody
    • FLJ92943 antibody
    • LFS1 antibody
    • Mutant tumor protein 53 antibody
    • p53 antibody
    • p53 tumor suppressor antibody
    • P53_HUMAN antibody
    • Phosphoprotein p53 antibody
    • Tp53 antibody
    • Transformation related protein 53 antibody
    • TRP53 antibody
    • Tumor protein 53 antibody
    • Tumor protein p53 antibody
    • Tumor suppressor p53 antibody
    see all


  • All lanes : Anti-p53 antibody [PAb 1801] (ab28) at 5 µg/ml

    Lane 1 : Wild-type HCT116 cell lysate at 30 µg
    Lane 2 : Wild-type HCT116 + irinotecan (10 µM, 24 hours) cell lysate at 30 µg
    Lane 3 : p53 knockout HCT116 cell lysate at 30 µg
    Lane 4 : p53 knockout HCT116 + irinotecan (10 µM, 24 hours) cell lysate at 30 µg
    Lane 5 : A431 cell lysate (positive control) at 20 µg
    Lane 6 : Saos-2 cell lysate (negative control) at 20 µg
    Lane 7 : MEF cell lysate at 20 µg
    Lane 8 : Wild-type HAP1 cell lysate at 20 µg
    Lane 9 : p53 knockout HAP1 cell lysate at 20 µg

    Performed under reducing conditions.

    Predicted band size: 53 kDa

    Lanes 1-9: Merged (red and green) signal.

    Ab28 was shown to specifically react with p53 in wild-type HAP1 and HCT116 cells treated with irinotecan. No band was observed in p53 knockout HAP1 or HCT116 cells. Wild-type and p53 knockout samples, positive and negative controls were subjected to SDS-PAGE. Ab28 and ab181602(loading control to GAPDH) were diluted 5 μg/mL and 1/10,000 respectively and incubated overnight at 4°C. Blots were developed with goat anti-rabbit IgG (H + L) and goat anti-mouse IgG (H + L) secondary antibodies at 1/10,000 dilution for 1 h at room temperature before imaging.

  • Anti-p53 antibody [PAb 1801] (ab28) at 5 µg/ml + MDA-MB-231 (Human breast adenocarcinoma cell line) Whole Cell Lysate at 20 µg

    Goat Anti-Mouse IgG H&L (HRP) preadsorbed (ab97040) at 1/10000 dilution

    Developed using the ECL technique.

    Performed under reducing conditions.

    Predicted band size: 53 kDa
    Additional bands at: 53 kDa, 60 kDa. We are unsure as to the identity of these extra bands.

    Exposure time: 20 minutes

    This blot was produced using a 10% Bis-tris gel under the MOPS buffer system. The gel was run at 200V for 50 minutes before being transferred onto a Nitrocellulose membrane at 30V for 70 minutes. The membrane was then blocked for an hour using 3% Milk before being incubated with ab28 overnight at 4°C. Antibody binding was detected using an anti-mouse antibody conjugated to HRP, and visualised using ECL development solution.


    We recommend using 3% milk as the blocking agent for Western blot.

  • Analysis of recombinant p53 protein (ab43615) in MCF7 cells treated with vehicle (VEH)as well as MCF7 cells treated with camptothecin (CAM) and no material (NO) by sandwich ELISA with the use of anti-53 antibody (ab28) as capture and anti-p53 antibody (ab32389) as detector.
  • All Lanes: Anti-p53 antibody [PAb 1801] (ab28) at 5 µg/ml

    Lane 1 and 10: Wild-type HCT116 cell lysate

    Lane 2 and 11: Wild-type HCT116 + irinotecan (10 µM, 24 hours) cell lysate

    Lane 3 and 12: p53 knockout HCT116 cell lysate

    Lane 4 and 13: p53 knockout HCT116 + irinotecan (10 µM, 24 hours) cell lysate

    Lane 5 and 14: A431 cell lysate (positive control)

    Lane 6 and 15: Saos-2 cell lysate (negative control)

    Lane 7 and 16: MEF cell lysate

    Lane 8 and 17: Wild-type HAP1 cell lysate

    Lane 9 and 18: p53 knockout HAP1 cell lysate

    Lanes 1-9: 1% BSA blocking buffer

    Lanes 10-18: 3% Milk blocking buffer

    Goat Anti-Mouse IgG H&L (HRP) at 1/5000 dilution

    We recommend using 3% milk as the blocking agent for western blot.

  • The image shows a Western blot for ab28, testing the threshold detection of the p53 antibody. The lanes are as follows:

    Lane 1 - 20ug of A549 lysate, lane 2 - 10ug of A549 lysate, lane 3 - 5ug of A549 lysate, lane 4 - 2.5ug of A549 lysate, lane 5 - 1.5ug of A549 lysate.

    This picture was submitted as part of the review by Craig Carson.




This product has been referenced in:
  • Li Y  et al. MiR-875 and miR-3144 switch the human papillomavirus 16 E6/E6* mRNA ratio through the EGFR pathway and a direct targeting effect. Gene 679:389-397 (2018). Read more (PubMed: 30205176) »
  • Moghadam FH  et al. Ferulic Acid exerts concentration-dependent anti-apoptotic and neuronal differentiation-inducing effects in PC12 and mouse neural stem cells. Eur J Pharmacol 841:104-112 (2018). Read more (PubMed: 30332611) »
See all 41 Publications for this product

Customer reviews and Q&As

1-10 of 16 Abreviews or Q&A


Thank you for contacting Abcam.

I am sorry about all the problems you have been having with ab28 in western blot. I just had one more protocol that you used.:

What primary antibody concnetrations did you try?

I look forward to your rpely and helping you resolve this issue. The antibody is covered under our Abpromise for six months and is guaranteed to work in western blot on rat and humansamples . If we cannot resolve the issue you are having with the antibody then I would be happy to either send a replacement antibody or to process a refund.

Read More
Western blot
Mouse Cell lysate - whole cell (Colon cancer cell line)
Gel Running Conditions
Reduced Denaturing (12% gel)
Loading amount
30 µg
10 µM CPT-11 for 24 hrs
Colon cancer cell line
Blocking step
Milk as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 21°C

Anke Rauch

Verified customer

Submitted Jun 28 2016

Western blot
Mouse Tissue lysate - whole (Colon lysate)
Gel Running Conditions
Non-reduced Denaturing (10%)
Loading amount
20 µg
NoTreated and DSS-treated
Colon lysate
Blocking step
Milk as blocking agent for 20 minute(s) · Concentration: 10% · Temperature: 25°C

Dr. Natalia Volodko

Verified customer

Submitted Aug 07 2015

Immunocytochemistry/ Immunofluorescence
Human Cell (Human medulloblastoma cell line D556)
Yes - 0.3% Triton X-100
Human medulloblastoma cell line D556
Blocking step
BSA as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 25°C

Abcam user community

Verified customer

Submitted May 11 2015

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections)
Blocking step
BSA as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 22°C
Antigen retrieval step
Heat mediated - Buffer/Enzyme Used: 10 mM Sodium Citrate
Mouse Tissue sections (mouse brain cerebellum)
mouse brain cerebellum
Yes - 0.3% Triton X-100

Abcam user community

Verified customer

Submitted Feb 23 2015

Western blot
Loading amount
20 µg
Gel Running Conditions
Reduced Denaturing
Mouse Tissue lysate - whole (mouse cerebellum)
mouse cerebellum
Blocking step
Milk as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 22°C

Abcam user community

Verified customer

Submitted Apr 03 2014

Immuno-precipitation step
Protein A/G
Human Cell lysate - whole cell (Human 293T cells)
Human 293T cells
Total protein in input
200 µg

Abcam user community

Verified customer

Submitted Mar 31 2014


Thank you for contacting us.

Your credit note ID is **********.

I am sorry that this antibody did not perform as stated on the datasheet. I have asked our accounting department to issue a credit note for you, which can be redeemed against the invoice of a future order by passing it on to your purchasing department. To avoid confusion, please ensure your accounts department is aware of how the credit note is being used. If you have questions on how to use the credit note, please contact our accounting department.

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The credit note ID is for your reference only and does not automatically guarantee the credit.

I hope this experience will not prevent you from purchasing other products from us in the future. Our Scientific Support team is always at your service, should you require further expert advice.

Read More


Thank you for contacting us.

Our p53 antibody ab26 has been optimized by loading 20 ug per lane of HeLa cells, using 5% BSA as the blocking agent for 1 hour at room temperature, and incubating with the primary antibody at a concentration of 5ug / mL overnight at 4C. To view the protocols used by our customers, you can browse our WB Abreviews for this product:


Ab28 and ab1431 can be used with a similar protocol, loading 20-40 ug mer lane, using a 5% milk block, and a primary antibody dilution of 1:1000.

We will ship anywhere in the UK or US overnight for next day delivery. I hope this helps, please let me know if you need any additional information or assistance.

Read More


Thank you for your inquiry. We have a number of antibodies in our catalog that might be of interest to you. I would like to direct you to the search facility on our website (www.abcam.com). Please enter the name of the protein into the search box at the top of the home page. A list of products will be generated which can be further refined using the filters on the left hand side of the page. Using these filters will help you to identify products that have been tested in the applications and species you are interested in. We have many BCl2 products in catalogue however I can recomend using ab18210 as it was tested in Immunohistochemistry on rat tissue sections. ab18210: https://www.abcam.com/Bcl2-antibody-ab18210.html The recomended p53 antibodies would be ab26; https://www.abcam.com/p53-antibody-P-ab26.html ab28; https://www.abcam.com/p53-antibody-P-ab28.html ab2433; https://www.abcam.com/p53-antibody-ab2433.html The recommended Ki67 antibodies are; ab66155; https://www.abcam.com/Ki67-antibody-ab66155.html ab16667; https://www.abcam.com/Ki67-antibody-SP6-Proliferation-Marker-ab16667.html We have region specific prices for the antibodies. The best way to know the price is by selecting the country of your origin displayed on top right corner of the datasheet. The system will automatically give you the price and shipping charges. Please be also advised that you would also need fluorophore or enzyme conjugated secondary antibodies. I have attached a protocol booklet where protocol of each application has been nicely explained including the ingredients required. Please go through it and decide which antibody and reagent you require. I hope this information is helpful to you. If you have specific questions about the products identified during the search, please do not hesitate to contact me.

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1-10 of 16 Abreviews or Q&A

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